Suzuki VLR1800 Service Manual page 152

1A-83 Engine General Information and Diagnosis:
Active Control Inspection (ISC RPM Control)
Check 1
1) Set up the SDS tool. (Refer to the SDS operation
manual for further details.)
2) Check that the engine is running.
3) Click the "Active control".
4) Click the "ISC rpm control" (1).
5) Check that the "Spec" (2) is idle speed 900 ± 100
rpm.
6) Check that the "Desired idle speed" (3) is within the
specified idle rpm.
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Check 2
1) Click the button (4) and decrease the "Spec" (2) to
800 rpm slowly.
2) Check that the "Desired idle speed" (3) is nearly
equal to the "Spec" (2). At the same time, check that
the number of steps (5) in the ISC valve position
decreases.
3) Click the button (6) and increase the "Spec" (2)
slowly.
4) Check that the "Desired idle speed" (3) is nearly
equal to the "Spec" (2). Also, check that the number
of steps (5) in the ISC valve position increases.
Check 3
1) Click the button (6) and increase the "Spec" (2) to 1
400 rpm slowly.
2) Check that the "Desired idle speed" (3) is nearly
equal to the "Spec" (2). Also, check that the number
of steps (5) in the ISC valve position increases.
NOTE
Be careful not to increase the "Spec" to 1 500
rpm, or the "Engine speed" may reach the
upper limit.
If the ISC valve does not function properly, inspect the
ISC valve or replace the ISC valve. Refer to "DTC "C40"
(P0505 / P0506 / P0507): ISC Valve Circuit Malfunction
(Page 1A-80)" or "Throttle Body Disassembly and
Assembly in Section 1D (Page 1D-12)".
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4
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5
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3
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